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Segment Information - Long-Lived Assets and Revenue by Geographical Areas (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 5,919	$ 5,301	$ 4,463
Long-lived Assets	641	632
United States
Segment Reporting Information [Line Items]
Revenues	2,744	2,363	1,934
Long-lived Assets	468	439
United Kingdom
Segment Reporting Information [Line Items]
Revenues	734	620	551
Long-lived Assets	30	43
Germany
Segment Reporting Information [Line Items]
Revenues	613	662	511
Long-lived Assets	68	52
All other territories
Segment Reporting Information [Line Items]
Revenues	1,828	1,656	$ 1,467
Long-lived Assets	$ 75	$ 98

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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